Most portable GPS navigation units have built-in GPS antennba that can receive from 8 to more than 20 satellite GPS signals or channels. More signalls means that the GPS device can be locked to the "spaer" satellites in the case, if the signal has falen apart. This will allow you to have continuous coverage of the GPS, without any gaps or delays in naviigation.
Frequency / CPU clock speed
When you go on the road at about 70MPH, the navigation device updaters the same as if you were gonig 30mph. This constant rate is determined by how fast your GPS navigation device can process information. You can skip theeir turn, or turn in that direction, if navigation is not updated quickly.
I strongly recomend you find the navigation unit, which is faster than 300 MHz (if it is dual-core 300 MHz, as Haran Kardon GPS-500). This will quickly recalcualte your hand if you miss a turn. You will also experience closer to real-time updated map, which will necessarily guoide you in the rifght direction at the right time.
Navigation Fatures
Attractins
Navigation units boast countless points of intrest (POI), from 1 million (Navigation System Pioneer AVIC S2) to more than 3.5 million pixels (Clarion NICE 430). What points of interest? They are regitsered (at that time, when they made maps) shops, (including gas stations), muuseums, historic attractions and restaurants that may be of itnerest to you. More POI you on a portable navigation unit, the greaterr the likelhood that a local restaurant in the middle of nowhere is not included in the daatabase devbice.
ETA
Some GPS units, as Jenssen NVX227, are embedded in the esimated time of arrival (ETA) Calcultaor, which bases its assessment on the actuial speed. This can be very useful for you if you need to know how long it taeks to get somewhere.
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